This will seem a little odd, but the Dayton PS180 (6 1/2" full range w/ whizzer cone) can actually function as a very nice tweeter. I have successfully used it crossed over around 5k, first order. I suspect that the whizzer cone is doing most of the work at this frequency and the larger cone actually becomes a waveguide.
My old Wharfedale super 3s are still working well. Admittedly they have a zobel network and series notch filter. Currently two per side in parallel.
Bass speaker (sorry sub woofer) is a Wharfedale w15rs in a large enclosure.
Bass speaker (sorry sub woofer) is a Wharfedale w15rs in a large enclosure.
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The smallest Mark Audio Alpair drivers and also some smallest Fostex drivers make good tweeters.
There are concave tweeters which could be described as cones
something like the Focal tweeter, where the “cone” is typically stiffer than a dome that is convex.
dave
The question is: why are there none of those nice little 3” (like MA A5.2/3 and the Fostex FF85wk) made such that they olny go down to 2-300 Hz and have much higher sensitivity.
The Faitals have a big Vas which leads to an atypical 3” sensitivity.
dave
I would presume that a dome better resists pressure, whilst a cone better resists inertia/acceleration; and a speaker is exposed to more inertia forces than pressure. I would also presume that the dispersion of a dome is even, but an inverted cone would by down on axis. But I welcome correction on any of that.
I will let others with more experience with tweeter measurements to dissuade you of that thinking.
I have seen more than 1 tweeter with off-axis that is no better than some small FRs used as midTweeters.
dave
@cracked case , while the dome looks like the right shape to initiate the expected hemispherical dispersion, it doesn't actually move that way. It just moves back and forth. Also, domes do breakup, typically above 20k. Domes do support a 1" voice coil.
Cone breakup and dispersion issues would be my guess as to why cone tweeters are not more popular than they are.
Hi JMFahey, I am pretty sure you also remember this ones:In certain applications they are very valid and quite useful.
So much so for me that I actually made my own, go figure.
I make MI amplifiers, speakers and cabinets, and here:
* they reach low, they can be crossed over down to 1500Z (try that with most domes, except maybe some $350 Focal dome o something)
* they handle honest 25/30W RMS.
Translate that to 350W RMS cabinets.
If biamped, can safely be used with a 40/50W RMS amp (LM3886?), because constant clipping at Bass frequencies is common (DJ/PA use); constant clipping at HF? not that much (it sounds F-ugly).
* MI and PA cabinets want to push sound straight ahead, where the Audinece is, so lobing is not a big deal and narrowing/focusing even less.
In fact, it´s a bonus 😉
* mine are LOUD, I used a strong motor (for a cone Tweeter) to achieve that: 76mm by 10mm magnets (twice as usual weight), 19mm high power voice coils, 6mm high gap.
The JBL LE25 has been used in very well regarded Studio monitors:
Wow!
I used to purchase speakers from them and also from a "spin-off" of their factory, I think they were called "Tec-Sound", we are talking of the 80s in Argentina...
Then came the EV manufactured by Sonotechnika (the Hapke brothers) and also Audiosystem speakers (Hugo Scarone, who manufactured for Holimar).
Osvaldo, you are always making me fly back on time!
Cheers
Those years of 1 peso=1 U$S killed my small manufacturing of power amps and I became mostly an audio contractor purchasing stuff from the big importers, although I always kept manufacturing my own substractive crossovers and dedicated speaker equalizers for the installations I did (these were pre-DSP times...)
I confirmed the A5.2 (publ. Fo~95hz, Vas~1.8L) began rolling off ~140hz in ~3.5L sealed, as expected. Next step would be to fill the cab with coke cans to raise Fb and roll-off further up.
https://www.diyaudio.com/community/...r-5-2-in-evansound-3-75l.393909/#post-7220838
I sold a set of those to Troels. Nice tweeter.
The Peerless 2” with the Al dustcap was good, and i have had some quite nice 2” Japanese tweeters including these Corals (unfortunately 1 was dead).
dave